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My experience with my cycle has been that going from E10 87 octane to 91 w/o I see a 4% increase in mileage. My hwy mileage went from a consistent 53 to 55 with the switch. I recently found 87 octane (recommended) w/o Ethanol, and hope to see additional improvements.
87 w/o Ethanol is $ .10 more per gal.
Jay
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